The Laser Ignition and the In Combustion Event Feedback of Internal Combustion Engines

Page, VS
(2018) The Laser Ignition and the In Combustion Event Feedback of Internal Combustion Engines. Doctor of Philosophy thesis, University of Liverpool.

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Laser ignition is one of the latest attempts to improve the efficiency and performance of an IC engine. It is slightly unique in that the ignition source is one of the few component of a spark ignited engine that has not been changed in a long time. It is a system that allows a lot of freedom in what can be done with it. Common freedoms are the spatial placement of the spot, splitting the laser into multiple spots, and firing multiple lasers into the engine during a single cycle. It is the last that this thesis is mostly concerned with. Temporal variations are uniquely allowed by lasers over spark plugs, as the optical access allows multiple lasers to be fired into the engine without changing the geometry of the engine. In this thesis, dual pulse laser ignition is investigated, first in a holistic calibration of the timings under a range of engine operating parameters and then selectively with a method of deciding when and if to fire a secondary laser pulse into the engine. It was found that the dual pulse ignition is beneficial to the engine in terms of power efficiency and stability, but only under certain conditions. The magnitude of the benefit is not insignificant, where 1.1% to 2.2% at λ = 1.4 increases in the engine efficiency has been found. The selective firing of the second pulse has also been found to provide benefits and it was found that a potential increase of 3% and 5.5% for λ = 1.35 is possible.

Item Type: Thesis (Doctor of Philosophy)
Divisions: Faculty of Science and Engineering > School of Engineering
Depositing User: Symplectic Admin
Date Deposited: 08 Aug 2018 10:45
Last Modified: 29 Jun 2021 07:12
DOI: 10.17638/03021746